Both Corbin and Strowman, two "WWE-grown" monsters that couldn't do shit when they started are now among the most entertaining guys on their respective brand.
Also the Deep Six is a sweet move
Strowman was never a guy that couldn't do anything. He was just a protected guy in the Wyatt family that WWE only had wrestle in non-televised NXT matches. He was just green and they know better not to put a big green guy on television to embarrass himself. See: Nathan Jones.